Golly Ghost. I only ever saw one of these at Chuck E. Cheese's. I must have been in first grade or maybe even kindergarden, and the first time I saw it I was in awe. It's a combination of using an actual physical background and video game graphics - the background models would open (like a door, chest, toilet, etc.) when the ghosts would come in or out of the room.
As we age, our sense of wonder fades. Seeing that game as a child was awesome to me, in the truest sense of the word. I was awestruck. It was like watching magic. I can never have that feeling again.
Looking on youtube, here's a great video of it:
https://www.youtube.com/watch?v=bnK9t0ebiV8
Skip to around the 7:00 mark to see the diorama up close.
Even if I could play this game again, I'm sure I would smile, but that sense of wonder would be gone.
edit: not Chuck E. Cheese, it was still called Showbiz at that time. Makes me think what kids are awestruck with now.